New supply hose made a WOLRD of difference

[dpuckett]

Here is the thread leading up to this. I finally got around to checking my rubber hose on my supply side. Somewhere along the line, my steel lines had been replaced with rubber. But who knows how long it had been, and the ends past the worm clamps were rotting and cracking, so I figured the rest of the 11ft section wasnt much better. Eight and a half bucks after a trip to NAPA, I had new hose. (The fuel tank assembly is easy to get at with my flatbed . I changed out the hose, and started her up. Right away, I noticed a change in the smell of the exhaust. Not near as acrid, almost a sweet smell, like the newer ones in good shape have.



Took it for a test drive, and I NOW HAVE NORMAL EGTs!!! Havent gone out on I-55 yet, but around town, temps are similar to Mom's when accelerating and "cruising" at 40mph. So, there is hope yet. Also, idle is smoother (no longer shakes like a wet dog, as they say), and smoke has been reduced to nearly zero Oo. I can no longer obliterate the car behind me. Hopefully, this will result in a similar positive change in my MPGs.



Just a thought for those at wit's end as to why their engine isnt running right. I may cut into the hose tomorrow and see what it looks like.



Daniel

 

[DSteimle]

wow, bonus points for using "acrid" in a sentence. course they're deducted for misspelling "world":-laf



now really, was it sucking air or line collapsing? do you have a fuel pressure gage? reason i'm asking is i'm preparing to replace every piece of fuel line on my truck and want to look for possible pitfalls.



thanks

daryl

 

[PToombs]

Glad you got it fixed DP.



Minus extra points for misspelling "normal". :-laf

 

[THeske]

wow, bonus points for using "acrid" in a sentence. course they're deducted for misspelling "world":-laf



now really, was it sucking air or line collapsing? do you have a fuel pressure gage? reason i'm asking is i'm preparing to replace every piece of fuel line on my truck and want to look for possible pitfalls.



thanks

daryl

And the teacher is corrected:::::: Your points are pulled for misspelling gauge ( As in fuel pressure GAGE ), At least he had all the correct letters in his paragraph, see teacher how easy it is to foul up, Give him his points back

 

[PToombs]

I love this place!

 

[GOlsen]

And the teacher is corrected:::::: Your points are pulled for misspelling gauge ( As in fuel pressure GAGE ), At least he had all the correct letters in his paragraph, see teacher how easy it is to foul up, Give him his points back

Actually, the American Heritage Dictionary notes "Gage" is an allowable spelling for "Gauge. " The only reason I actually know this is the fact that I'm in the Navy, and they spell it gage on everything. When I tried to prove that it was incorrect, I was thwarted. #@$%!:-laf

 

[Jgolden]

Thwarted, another nautical term.



Daniel, glad your new hose works. It's on my list.

Interesting that restricted fuel supply would cause higher EGT's.

Thanks for the info.

 

[dpuckett]

The ends of the hose were starting to crack, as well as the outer edge of a few bends, etc, thus likely letting in some air, which will affect atomization ,fuel pressure, etc. Even though I had good FP, the air messes stuff up. The new hose also gave me about 1psi more fuel pressure. I now run 7. 5-8psi at 75mph cruise. My speedometer took a nap (actually, the nut holding my output yoke backed off a hair, causing my speedo gear to slip), so I cant make any accurate reports on MPG improvement.



DP

 

[DieselBuzz]

Daryl,

Can you use the shift key more often? Please?



Points back to Daniel, one for admitting he can't smoke anyone out, two for using "obliterate" to explain it. :-laf

 

[dpuckett]

Hey, I have always thought of smoke as wasted fuel. I dont like to see any more than a brief puff when accelerating from a stop with a GCVW of 20K. Either I need turbo/ airflow improvements, or the injectors arent spraying like they should.



DP

 

[MMiller]

Its a little odd to me that your fuel lines would have remidied your problem. On the Cats I work on, a little air in the fuel will cause fuel pressure problems, make hard or impossible starting, and will cause missfires, low power, etc. I guess the stuff I work on is more finicky with HUEI injectors, common fuel rails, etc... ... ...



Kinda makes me think I oughta put a fuel pressure gauge on my ride and see what its doing. Ya, you'd think a diesel mechanic would check his fuel pressure on his ride, wouldn't ya... .



Michael

 

[RWWinslow]

HUEI / common rail systems are a lot more sensitive to air entrained fuel. These older Bosch VE systems and the older CAT fuel injection systems such as found on the older 3406 B engines were much more tolerant of air entrained fuel - up to a point - than the new injection systems and engines.



If anyone has a good source of diesel fuel hose, please post the source / link. The current fuel line which is rated for the fuel injection / multi-fuel / diesel systems may not be that good. Generic gasoline fuel line will not hold up to the suction side of our diesels - been there and tried that one. . . .

 

[ARhine]

What did it do to the EGTs? up or down?

My 93 has the stock poly looking hardline on it, doesn't leak anywhere but wondering how I would go about checking it. Are their seal kits for the couplers on the end or just o-rings in there?

 

[Sri Ram]

If anyone has a good source of diesel fuel hose, please post the source / link. The current fuel line which is rated for the fuel injection / multi-fuel / diesel systems may not be that good. Generic gasoline fuel line will not hold up to the suction side of our diesels - been there and tried that one. . . .

What about using transmission hose instead?

 

[DSteimle]

Daryl,

Can you use the shift key more often? Please?



Yeah, i guess i could do that . It really used to bug my teachers when i handed in a 3 page paragraph:-laf .

 

[btoscano]

Hey all,



I have tried a few different kinds of hoses and will relay my results. First off, NAPA in the San Diego & Flagstaff, Ariz. markets sells Weatherhead hose. In the Nashville, Tenn. market NAPA sells Gates hoes. The part numbers on the invoice will be either Weatherhead or Gates part numbers and they are not the same. When I was in Nashville, NAPA was unable to bring up Weatherhead part numbers that were good in Flagstaff or San Diego. Keep this in mind when ordering. Good quality fuel hose costs $3-4/foot. I would suggest going with high pressure fuel hose, about 350-400 PSI as these are far less likely to collapse than the regular, $1 or less/ft fuel hose designed for carbuerated systems. The transmission cooler hose I used was very soft and seemed likely to collapse. My truck does not use enough fuel for this to happen, to my knowledge, because its nearly stock, but I'd bet the modified engines would. I can get you all the part numbers from NAPA that I used in a few days when I have access to my records.



Brian

 

[JLEONARD]

When I set up my boat I used all high pressure Parker hose and hydraulic fittings. Yes mucho overkill, but wil never present a problem.